/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package info.niwota.frames;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.text.Layout;
import android.util.AttributeSet;
import android.widget.TextView;

/**
 * TextView that draws a bubble behind the text. We cannot use a
 * LineBackgroundSpan because we want to make the bubble taller than the text
 * and TextView's clip is too aggressive.
 */
public class ActionMenuButton extends TextView {
	private static final int CORNER_RADIUS = 8;
	private static final int PADDING_H = 5;
	private static final int PADDING_V = 1;

	private final RectF mRect = new RectF();
	private Paint mPaint;

	public ActionMenuButton(Context context) {
		super(context);
		init();
	}

	public ActionMenuButton(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
	}

	public ActionMenuButton(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init();
	}

	private void init() {
		setFocusable(true);
		// We need extra padding below to prevent the bubble being cut.
		setPadding(PADDING_H, 0, PADDING_H, PADDING_V);

		mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
		mPaint.setColor(getContext().getResources().getColor(
				R.color.bubble_dark_background));
	}
	
	@Override
	protected void drawableStateChanged() {
		invalidate();
		super.drawableStateChanged();
	}

	@Override
	public void draw(Canvas canvas) {
		final Layout layout = getLayout();
		final RectF rect = mRect;
		final int left = getCompoundPaddingLeft();
		final int top = getExtendedPaddingTop();
		//
		final int mScrollX = getScrollX();
		final int mRight = getRight();
		final int mLeft = getLeft();
		//
		rect.set(left + layout.getLineLeft(0) - PADDING_H, top
				+ layout.getLineTop(0) - PADDING_V, Math
				.min(left + layout.getLineRight(0) + PADDING_H, mScrollX
						+ mRight - mLeft), top + layout.getLineBottom(0)
				+ PADDING_V);
		canvas.drawRoundRect(rect, CORNER_RADIUS, CORNER_RADIUS, mPaint);

		super.draw(canvas);
	}
}
